Please
Help us to Help you In order to help fully we need more information....
- What OS are you using? is it up to date?
- What email program are you using - if applicable?
- avast! version and VPS file (virus database) number, e.g. 0436-4 (see about avast!)
- What was the virus name, what was the filename, where was it found
example (C:\windows\system32\infected-filename.xxx)?
Also see this thread for further information and advice
User's FAQ.
A search of these forums for JS:TrojDnldr will no doubt return many hits as I believe this topic has been previously discussed a number of times.
Ensure that you OS is fully up to date.
Also a visit to Eddy's HiJackThis Info and Analysis page,
HijackThis log file analyzer and follow the directions there and get back to us if you need more help....